Readers offer their best tips for deleting your Google Voice number, avoiding duplicate items in your pantry, and using Gmail in IFTTT.

Every day we receive boatloads of great reader tips in our inbox, but for various reasons—maybe they're a bit too niche, maybe we couldn't find a good way to present it, or maybe we just couldn't fit it in—the tip didn't make the front page. From the Tips Box is where we round up some of our favorites for your buffet-style consumption. Got a tip of your own to share? Add it in the comments, email it to tips at lifehacker.com, or share it on our tips and expert pages.

Avoid Buying Extra Groceries by Taking a Picture of Your Fridge

Often we waste money on buying things at the grocery store we didn't realize we already had in the fridge at home. Those things end up going bad and money goes down the drain.

Since most Americans have something that can take a picture in their pocket at all times now, it makes sense to just quickly snap a pic before heading out the door. Refer to that picture later to make sure you don't already have what you're buying. Better, see if you can buy things to go with the food you haven't used yet.

Use Two Gmail Accounts in IFTTT with the Email Channel

I use one Gmail account for all of my correspondence and such and one Gmail account for all of my newsletter subscriptions, which is nothing new, but you can take this a step further with IFTTT.

IFTTT doesn't allow you to have two Gmail accounts to choose from, but it does allow you to use one email account for "Email" and a different account for "Gmail."

I use my standard Gmail for correspondence account for the Gmail channel and my newsletter subscription Gmail account for the email channel.

This set-up is perfect for having things like weather alerts that I definitely want to see to my main account and having things like new job posts, etc. to the second Gmail account for me to peruse when I have some free time.

Use a QR Code as Your Lock Screen Picture

Martin Lim explains his reasoning behind his new lock screen image:

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I take my personal laptop to work most everyday for work purposes and while I keep it pretty professional, the thing I felt "unprofessional" about was my lock screen icon. Using my profile photo seemed weird at work. The generic icons didn't serve me much purpose.

Replacing ones profile picture with the QR code has a couple of benefits. First, it looks very techy from the coworker's prying eyes. Second, if the laptop is "misplaced" or otherwise found by non-familiar hands, it is a clear indicator of who this laptop belongs to. My QR icon is a meCard containing my name, a (Google) phone number, address (in case the person decides to mail it back) and my non-personal email address. Obviously you don't want your login password to be any of the above.